Attributes

The name attribute gives the map a name so that it can be referenced. The attribute must be present and must have a non-empty value with no space characters. The value of the name attribute must not be a compatibility-caseless match for the value of the name attribute of another map element in the same document. If the id attribute is also specified, both attributes must have the same value.

[1] Starting in Gecko 5.0 (Firefox 5.0 / Thunderbird 5.0 / SeaMonkey 2.2), empty maps are no longer skipped over in favor of non-empty ones when matching when in quirks mode. For example, consider the following HTML:

[2] Prior to Gecko 5.0, the <img> element would have matched to the second, non-empty map. Now it matches against the first one, even though it's empty.

[3] From Firefox 17 the default styling of the <map> HTML element is display: inline; and no more display: block;. This matches the behavior of the other browsers and was already the case in quirks mode.